<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表格</title>
</head>
<body>
    <table border="1" width="500px" height="400px">
        <tr>
            <th>学号</th>
            <th>姓名</th>
            <th>年龄</th>
        </tr>
        <tr>
            <td align="center">s001</td>
            <td>Tom</td>
            <td>21</td>
        </tr>
        <tr>
            <td>s002</td>
            <td>Jack</td>
            <td>21</td>
        </tr>
        <tr>
            <td>s003</td>
            <td>Mary</td>
            <td>21</td>
        </tr>
        <tr>
            <td>s001</td>
            <td>Alex</td>
            <td>21</td>
        </tr>
    </table>
    <table border="1" width="300px" height="100px">
        <caption>表格的标题</caption>
        <tr>
            <td rowspan="2"></td>
            <td></td>
            <td></td>
            <td></td>
        </tr>
        
        <tr>
            <td colspan="3"></td>
        </tr>
    </table>
</body>
</html>